Floating Aerators IrelandFloating aerators or diffused aeration?
Floating surface aerators install into a live basin without draining it, cost less to put in and are serviced at the waterline. Submerged diffusers need the basin drained, grid pipework and a blower house, but can be more efficient in deep, steady tanks. For lagoons with a changing level, floating units are usually the practical choice.
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How do they compare?
- Installation: floating units go into a live basin on moorings; diffusers usually need the basin drained
- Capital cost: floating units avoid concrete bridges, grid piping and a blower house
- Maintenance: floating units are reached at the waterline with no diving; diffusers sit on the floor
- Flexibility: floating units can be moved by small boat or added as load grows
- Depth: floating surface aerators work best in 1.0 to 4.0 m; diffusers suit deeper tanks
- Gas stripping: surface splashing drives out hydrogen sulfide and methane
When are diffusers the better choice?
Deep, steady activated sludge tanks where the floor can be reached for maintenance and energy efficiency per kg of oxygen is the main concern.
Frequently asked questions
Do floating aerators need the lagoon drained?
No. They are lowered in and moored to the bank while the lagoon keeps working.